/**
 * Copyright 2016 Google Inc. All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/license-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the license.
 */

/**
 * Provides a function which randomly shuffles an array in place
 */
module.exports = function shuffle(a) {
	var j, x, i;
	for (i = a.length; i; i -= 1) {
		j = Math.floor(Math.random() * i);
		x = a[i - 1];
		a[i - 1] = a[j];
		a[j] = x;
	}
}